DocumentCode :
741475
Title :
Generalised look-up table concept for direct torque control in induction drives with multilevel inverters
Author :
Brando, Gianluca ; Dannier, Adolfo ; Del Pizzo, Andrea ; Rizzo, Renato ; Spina, Ivan
Author_Institution :
Dept. of Electr. Eng. & Inf. Technol., Univ. of Naples Federico II, Naples, Italy
Volume :
9
Issue :
8
fYear :
2015
Firstpage :
556
Lastpage :
567
Abstract :
This study deals with direct torque control (DTC) of induction motor drives when a multilevel inverter is involved. The proposed control technique is finalised to reduce the amplitude of torque oscillations and to improve the motor dynamic response regardless of operating speed conditions while assuring a satisfactory input current distortion. This is achieved by using a special look-up-table built with a novel approach. The control itself is based on the application in each sampling interval of one or two voltage vectors suitably selected, in order to ensure low electromagnetic torque ripple in steady-state operations and fast dynamic behaviour in transient operations. In the algorithm, the converter voltage vectors selection is carried out by using a novel look-up table whose entry points are computed by means of a specialised relation, starting from the outputs of multilevel hysteresis controllers. The suggested method, suitable for a generic multilevel inverter, is detailed for a neutral point clamped three-level inverter. The proposed algorithm is validated by several numerical results, and compared with a DTC algorithm based on a traditional three-speed range look-up tables. Finally, some experimental results, obtained with a scale laboratory setup, are shown, discussed and compared with the numerical ones.
Keywords :
angular velocity control; induction motor drives; invertors; power convertors; table lookup; torque control; vectors; voltage control; DTC; converter voltage vectors selection; direct torque control; fast dynamic behaviour; generalised look-up table concept; generic multilevel inverter; induction motor drives; low electromagnetic torque ripple; motor dynamic response improvement; multilevel hysteresis controllers; neutral point clamped three-level inverter; operating speed conditions; sampling interval; satisfactory input current distortion; steady-state operations; torque oscillation amplitude reduction;
fLanguage :
English
Journal_Title :
Electric Power Applications, IET
Publisher :
iet
ISSN :
1751-8660
Type :
jour
DOI :
10.1049/iet-epa.2014.0488
Filename :
7244268
Link To Document :
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